Multilepton signatures for scalar dark matter searches in coannihilation scenario

Chakraborti, Sreemanti; Islam, Rashidul

doi:10.1103/physrevd.101.115034

Cited by 3 publications

(19 citation statements)

References 72 publications

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“…To lift this degeneracy, in ref. [39], we introduced a Z 2even scalar triplet. The said scalar triplet otherwise does not play any role in the DM phenomenology, rendering the exercise ad hoc.…”

Section: Jhep03(2021)032mentioning

confidence: 99%

“…As mentioned previously, ours is a leptophilic model that can evade all the existing bounds on scalar singlet DM. For that, we consider dark-sector partner(s) which can either be a doublet [39] or a singlet fermion [55]. Previously in ref.…”

Section: Model Descriptionmentioning

confidence: 99%

“…Moreover, in ref. [39], we had pointed out that none of the observations was useful to distinguish between the two coannihilating particles. Here, in principle, the physical states of the dark leptons can be a mixed state between the same charge component of the doublet and the singlet.…”

Section: Model Descriptionmentioning

confidence: 99%

“…In ref. [39], the transition between the three kinds (pair, co-and mediator annihilation) of DM annihilation is depicted for a similar model with only a lepton doublet as the coannihilating partner of the scalar DM. In this work, this dynamics becomes more interesting in the presence of the charged singlet and doublet dark fermion mixing.…”

Section: Relic Density Analysismentioning

confidence: 99%

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Implications of dark sector mixing on leptophilic scalar dark matter

Chakraborti

Islam

2021

J. High Energ. Phys.

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We propose a new viable outlook to the mixing between a singlet and a doublet leptonic dark sector fields. This choice relaxes the dark matter (DM) search constraints on the quintessential scalar singlet DM as well as presents new opportunities for its detection in the lab. The mixing produces an arbitrary mass difference between the two components of the extra doublet in a gauge-invariant way, without introducing any new scale of electroweak symmetry breaking in the theory. It also provides a useful handle to distinguish between the dark sector particles of different isospins, which is a challenging task other-wise. As the dark leptons coannihilate non-trivially, the mixing effectively enhances the viable parameter space for the relic density constraint. In low DM mass regime, our analysis shows that with a non-zero mixing, it is possible to relax the existing indirect search bounds on the upper limit of the DM-Standard Model coupling. From the analysis of the $$ 3\tau +{E}_T^{\mathrm{miss}} $$ 3 τ + E T miss and $$ \mathrm{\ell}\tau +{E}_T^{\mathrm{miss}} $$ ℓ τ + E T miss channels for LHC at $$ \sqrt{s} $$ s = 13 TeV, we show that one ensures the presence of the mixing parameter between the dark sector particles of the theory by looking at the peak and tail positions of the kinematic distributions. Even with a tweak in the values of other free parameters within the viable parameter region, the distinct peak and tail positions of the kinematic distributions remains a constant feature of the model. While both the channels present us the opportunity to detect the mixing signature at the LHC/HL-LHC, the former gives better results in terms of a larger region of mixing parameter. From the fiducial cross section, the projected statistical significance for the integrated luminosity, $$ \mathcal{L} $$ L = 3 ab−1, are shown for a combined parameter region obeying all the existing constraints, where there is the best possibility to detect such a signature.

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Section: Jhep03(2021)032mentioning

confidence: 99%

Section: Model Descriptionmentioning

confidence: 99%

Section: Model Descriptionmentioning

confidence: 99%

Section: Relic Density Analysismentioning

confidence: 99%

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Implications of dark sector mixing on leptophilic scalar dark matter

Chakraborti

Islam

2021

J. High Energ. Phys.

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“…Due to the presence of the charged VLL, the present setup can also be probed at the LHC. Being a part of the SUð2Þ doublets, the charged VLLs can be pair produced at the LHC in Drell-Yan processes, pp → vectorlike leptons and antilepton pairs, and subsequently undergo Yukawa-driven decays into a DM scalar and a charged SM lepton, E AE → Sl AE and thus leading to a characteristic opposite sign dilepton plus missing energy (= E) signature [63,64]. In [65,66] which also has a similar setup as ours, the authors have shown that if the mass splitting between the charged and the neutral VLL is less than the mass of the W AE boson, then E AE can also decay via the three body suppressed process: E AE → E 0 l AE ν giving rise to the displaced vertex signature at LHC.…”

Section: Scalar Singlet Dm With Vectorlike Leptonsmentioning

confidence: 99%

Sub-TeV singlet scalar dark matter and electroweak vacuum stability with vectorlike fermions

2020

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We study a scalar singlet dark matter (DM) having mass in the sub-TeV regime by extending the minimal scalar singlet DM setup by additional vectorlike fermions. While the minimal scalar singlet DM satisfies the relic and direct detection constraints for mass beyond TeV only, presence of its portal coupling with vectorlike fermions opens up additional coannihilation channels. These vectorlike fermions also help in achieving electroweak vacuum stability all the way up to Planck scale. We find that for one generation of vectorlike quarks consisting of a SUð2Þ L doublet and a singlet, scalar singlet DM with mass a few hundred GeV can indeed satisfy relic, direct detection and other relevant constraints while also making the electroweak vacuum absolutely stable. The same can be achieved by introducing vectorlike leptons too, but with three generations. While the model with vectorlike quarks is minimal, the three generations of vectorlike lepton doublet and neutral singlet can also give rise to light neutrino mass at one loop level.

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Sub-TeV Singlet Scalar Dark Matter and Electroweak Vacuum Stability with Vector Like Fermions

Borah,

Roshan,

Sil

2020

Preprint

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We study a scalar singlet dark matter (DM) having mass in sub-TeV regime by extending the minimal scalar singlet DM setup by additional vector like fermions. While the minimal scalar singlet DM satisfies the relic and direct detection constraints for mass beyond TeV only, presence of its portal coupling with vector like fermions opens up additional co-annihillation channels. These vector like fermions also help in achieving electroweak vacuum stability all the way up to Planck scale. We find that for one generation of vector like quarks consisting of a SU (2) L doublet and a singlet, scalar singlet DM with mass a few hundred GeV can indeed satisfy relic, direct detection and other relevant constraints while also making the electroweak vacuum absolutely stable. The same can be achieved by introducing vector like leptons too, but with three generations. While the model with vector like quarks is minimal, the three generations of vector like lepton doublet and neutral singlet can also give rise to light neutrino mass at one loop level.

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Multilepton signatures for scalar dark matter searches in coannihilation scenario

Cited by 3 publications

References 72 publications

Implications of dark sector mixing on leptophilic scalar dark matter

Implications of dark sector mixing on leptophilic scalar dark matter

Sub-TeV singlet scalar dark matter and electroweak vacuum stability with vectorlike fermions

Sub-TeV Singlet Scalar Dark Matter and Electroweak Vacuum Stability with Vector Like Fermions

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